Geitz had then gone to his girlfriend's sister's North Toowoomba flat looking for his girlfriend, who wasn't there.

Instead, he confronted up to five people, including a 15-year-old boy who had the barrel of Geitz's gun shoved into his chin to the point that the boy fell over a gate as he backed away.

Mr Alsbury said Geitz had then kicked in the door of the unit and threatened his girlfriend's sister, grabbing her and pushing her up against a wall.

When she fought back, Geitz had held the shotgun barrel 5cm to 10cm from her head, before turning it toward himself.

He had then discarded the gun and run off, but was apprehended by police a short time later.

Yesterday, Geitz pleaded guilty to two counts of threatening violence in the night-time, assault occasioning bodily harm, wilful damage, two counts of assault, and torture relating to his actions against his girlfriend's sister.

Barrister Robbie Davies told the court his client was very drunk at the time, having had a major problem with alcohol for some years, and the incident would not have happened had he been sober. Fortunately, no serious physical injury had resulted and no victim impact statements from the complainants had been put before the court.

Geitz's girlfriend was in court for yesterday's proceedings.

Judge Grant Britton said he wanted to further consider sentence and adjourned the matter until this morning.